My Doc is taking me off amitriptyline perphenazine. How hard is it to do?

I currently take 20/4 amitriptyline perphenazine My Doc wants me off it How hard is it to do. I also take 37.5 mg of lamictal and .5 mg of ativan 3 times a day He told me to stop taking the morning dose of 10/2 and keep everything else the same. Is this realistic Can any one share their experiences and give advice I have been on the drug for about a year Thanks